Nady Systems WA-125U Owner's manual - page 8
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UH-4 HANDHELD MICROPHONE TRANSMITTER
UH-4 HANDHELD MICROPHONE TRANSMITTER
Transmitters set up
The UH-4 transmitter requires a single 9V battery to operate. To open the battery compartment,
unscrew the BATTERY COVER (22) with a counter-clockwise turn and remove the cover, exposing
the BATTERY HOLDER (23). Insert a fresh 9V battery according to the correct polarity as indicated
on the transmitter body. Screw cover back onto the microphone. Make sure the cover is screwed on
completely. Fresh alkaline batteries can last for up to 10 hours of operation, but in order to ensure
optimum performance, it is recommended that the batteries should be replaced after 6-8 hours of
use.
Microphone Operation
To turn transmitter on, slide the OFF/STANDBY/ON SWITCH (24) to the STANDBY position first
(transmitter on, audio muted) or the ON position (transmitter and audio both on). The LOW BAT
LED (25) will give a single flash, indicating usable battery strength. In case of dead or low battery,
the LED will either not go on at all or will stay on continuously. During use, if the LOW BAT stays on
continuously, it is indicating that the battery should be replaced with a fresh one. To preserve bat-
tery life, turn the transmitter off when not in use. Keep line of sight between WA-125U receiver and
wireless transmitter whenever possible to ensure optimum performance and maximum range.
Level Trim Adjust
For optimum performance, an INPUT LEVEL CONTROL (21) is provided for the transmitter. Adjust
the microphone gain by inserting a small slot-headed screwdriver through the adjustment hole,
located on the topside of the battery compartment, under the compartment cover. Factory setting
is 1⁄2 full. This is a setting to be used in most typical close microphone applications. Depending on
the average distance between vocalist’s mouth and microphone, you can adjust the level for your
application. Set for maximum possible gain and headroom without noticeable distortion of the high
level peaks. It is recommended that the level be set at about 1⁄2 maximum. Experiment and set for
maximum possible gain without audible distortion on the high level peaks.
Receiver Volume Controls Adjust
The PA sound output level is control by the volume control MIC/TX knob. If feedback (howling
sound) occurs, try first turning down the TREBLE CONTROL (7). If feedback still is present, try
turning down the VOLUME (6) or repositioning the WA-125U with respect to the wired or wireless
mic being used.
The handheld microphone is now ready to use. The RF ON indicator on the receiver should now
be on, indicating a received signal from the transmitter. When ready to speak, slide the OFF/
STANDBY/ON SWITCH (24) to the ON position. Adjust the volume of the receiver as outlined in the
Receiver Operating Instructions section: Operating the WA-125U.
Notes:
• Turning down the gain too much can compromise the signal-to-noise and it is not recommended
• The battery compartment on the UH-4 functions as a built-in antenna. For proper operation, it
should not be covered by the hand or touched during operation.
• Observe care in selecting P.A. volume, transmitter location and speaker placement so that acous-
tic feedback (howling or screeching) will be avoided.
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